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Find all number a for which each of the ...

Find all number `a` for which each of the following equalities hold true? (a) `(log)_1a=2` (b) `(log)_(10)(a(a+3))=1` (c) `log_(1//3)(a^2-1)=-1` (d) `(log)_2(a^2-5)=2`

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